How do I power a 19 inch monitor with a battery?

I'm a 'later in life' video enthusiast who struggles seeing the lcd screen on my camcorder.  I want to just use my spare 19 inch computer monitor as my camcorder monitor so I need a way to power it with a battery whenever I don't have access to an electrical outlet.

Can anyone help me or point me to related links on the internet?


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DanielD44 months ago

There are many DisplayLink monitors today that run on USB power only. They are designed to be connected to a laptop, and thus they would be powered by the laptop's battery. The typical size is 15.6", but there are some other sizes available. You can get a 1366 x 768 USB monitor of that size for under $100.

mazelady (author) 2 years ago

Thank you for all the suggestions and warnings. Now I understand why those 7" Lilliput monitors are so expensive.

My brother suggested just using a car adapter and a very long extension cord when filming outdoors. That would give me more options those not as much as a portable battery solution. I supposed I could also use a small generator. This is a lot of trouble for an amateur. The Lilliput monitor is cheaper than a generator but still very small but doable.

I learned a lot and thank you everyone!

-max-2 years ago

Just another thought: You could get 14 9V batteries, or 10 12V batteries connected in series to generate the 120V necessary, it should not matter that it is DC since the input to the majority of cheep switch mode power supplies is an bridge rectifier and smoothing capacitor that convert AC to DC anyway. if you do this be very careful not to come into contact with that much voltage, since it can deliver many, many amps of current (even the small 9V batteries can deliver upwards to 600mA, 60 times the amount to stop your heart).

iceng -max-2 years ago

Not really stop, but fibrillate into a quivering movement due to uncoordinated contraction of the individual fibrils http://en.wikipedia.org/wiki/Fibrillation

Like a ring counter, the bundle of His is firing out of sequence and as result

No blood will be pumped until another shock can force a normal sinus rhythm to be reestablished...

mazelady (author) 2 years ago

Yes, I've tried both. A small 12 volt battery would power a 19 inch lcd computer screen? Wow, I thought it would take much more.

Would the inverter have options to match the voltage required for the monitor? Do I need to be careful about using the wrong adapter?

Your looking for something that supplied the mains voltage for the screen you buy, 110 or 240v - Other then that your only worry is the power required. Generally LCD monitors draw little power - A lot of small inverters will provide 100 watts to 300 watts. Example from Amazon.


300 watts at 110 volts is 2.7 amps.

-max-2 years ago

What about a small 12V 100W AC inverter? That would be the simplest method, but if you can carefully pull the LCD screen apart, then inside there is a power circuitry and a digital motherboard. Find the ribbon cable going between the two boards, determine the different voltage levels, and get a few voltage regulators that you can hook up to a battery to supply those voltages. If you can, try to determine the current of the 3.3V, 5V, 12V, and other power rails so that you choose the best regulator for the job.

Some modern LED-LCD monitors have a power pack outside of the "ultra razor-thin" LED monitor, and generally that means you will only need one easy-to-make voltage regulator. (Generally those plug packs are 12V-19V, so you may need a boost converter for power if you do not want to use many batteries in series)

As for your choice in battery technology, some hobby-grade 3S or 4S LiPo's are cheap and can certainly deliver the power. You can also use a 12V car battery but I'd imagine that would not be quite "portable," that may only be an option if you are recording next to a car. If you want cheaper than LiPo's then all I can think of are SLA batteries, but energy density (esp. by weight) is considerably lower.

iceng -max-2 years ago

100W output means 120W input at the inverter and that needs 10A @ 12V for that shotgun crude approach to work.

If you disassemble the monitor you will find the higher voltage is only used for back illumination which can be easily split into several low voltage groups.

And the entire monitor will use much less then 100 watts.

-max- iceng2 years ago
If the monitor only draws 60W, then the inverter will probably only draw 20-30% more. Correct me if I am wrong, but Just because the inverter is rated for 100W maximum, that does not mean the load will draw that amount of current.

Also, I think it is probably the most viable choice for it's simplicity and low likelihood of making a mistake and tring the digital board inside the monitor. efficiency isn't everything.
iceng -max-2 years ago

Correct 60W output x 1.2 => 72W input and only 6amps from a 12V battery.

Depends on the skill of the hacker and the additional inverter bulk and weight. I have inadvertently damaged a mod in my time.

My best, all time most successful, engineering method on hacking has been to wait a year or two until the desire to hack an item passes and dwindles ...... to a what in the world ? was I thinking !

And by then there is a good chance China is now making making what I really wanted.

-max-2 years ago

There are ways you can just magnify the screen on the camcorder, like a large fresnel lens page magnifier.

iceng2 years ago

Most camcorders can feed a USB mem-stick, which you can insert to a video frame that runs on low voltage.

rickharris2 years ago

Assuming you can't get a monitor you can hook up to a DC power supply - You can get a small inverter to produce mains voltage from a 12 volt battery.

Assuming you don't need it to last for hours you can also get a small 12 volt battery that you could put in a belt pouch or use your car battery.

Have you tried a magnifying lens over the screen or reading glasses.?